Eel pass in Cumbria to be replaced

Work is underway to replace an outdated eel pass at Newby Bridge Weir to encourage better migration for the critically endangered European eel.

This is part of works by the Environment Agency to improve river ecosystems and support the safe migration of the European eel. The European eel has suffered a dramatic decline in recent decades due to habitat loss, overfishing and barriers such as weirs that disrupt its long migration routes.  

The existing fish pass at Newby Bridge is outdated and no longer meets modern standards for safety, remote monitoring, or effective water management. Formal notice has already been given for its removal, with the hope that the new improved eel pass will be fully installed and operational by March 2026.

  The project will introduce a hybrid eel pass system, designed to enhance eel migration and biodiversity while minimising any environmental impact.  

At the heart of the improvements is an intelligent float switch-controlled pump that will activate during low water flows to assist eel movement, ensuring their continued migration even in challenging conditions. During high water levels, the pump is automatically deactivated, allowing migrating eels to use the natural river flow. This is especially important to help promote effective movement to their local habitats. This adaptive pumping approach not only supports the local eel population but also reduces energy consumption, contributing to a more sustainable water management solution. 

Once completed, the pass will also feature pebble resin strips, a specialised material that aids eel movement while limiting the build-up of debris. During high flow the design allows for natural self-cleaning helps to maintain higher water quality standards by minimising blockages and stagnation. 

The system has been designed for easy visual inspection from the riverbank and will include remote monitoring capabilities, strengthening overall maintenance, reliability, and long-term resilience.